<p>搜索字符 "b", 是否存在：</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
funct...
JS 判断指定字符是否存在
JavaScript
JS if语句 赋值判断
JavaScript
<script>
var i;
var cars = new Array();
cars[0] = "Saab";
cars[1] = "Volvo";
cars[2] = "BMW";
cars[3] = "";
for...